Dry-pipe valve.



13. EVANS. DRY PIPE VALVE.

APPLICATION FILED DEO.4,1907.

% a sums-8mm: 1.

P. EVANS.

DRY PIPE VALVE.

' APPLICATION FILED 9204,1907.

898,856. Patented Sept. 15,1908.

2 SHEETS-SHEET 2.

l; nns, or PHILADELPHL\, P1; KLER F PHlLADELPHIA, PENN \NSYLVANIA,ASSlti-XOR l(,) INTERN A'llOXi n. s PRIN- SYLVANIA, A GORPORATION' Oi.PENXSYL ;\L ll;l.

DRY-PIPE VALVE.

No. assess.

Specification of Letters Patent.

Patented Sept. 15, 1908.

Application filed December 4, 1907. Serial No. 405,086.

T 0 all whom it may COTLCQ'WIL.

Be it known that I, POWELL EVANS, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in. Dry-Pipe Valves, of which the following is aspecificatimi.

()ne object of-iny invention is to valveof the claimed in my PatentsNos. 695,294, dated March 11, 1902, and 731,877, dated June 23, 1903,which shall possess certain improvements in the detail construction ofits mechanism, with the idea of making the device a whole more ellicientand certain in its action, as well as simpler in construction thanheretofore. These objects I attain in the following manner, referencebeing bad to the accompanying drawings, in which:-

Figure 1, is a vertical section of my improved valve; Fig. 2, is a rearelevation of the body-oi the valve; the various levers, etc,constituting its mechanism being omitted; Fig. 3, is a horizontalsection taken on the line 3-3, Fig. 2, and Figs. 4, 5, and 6, arevertical sections illustrating some of the various forms which may begiven to the bearing piece between certain portions ol the provide amechanism employed in my valve.

In the above drawings, A represents the main casting or body of thevalve which is normally carried upon a foot casting B and is dividedinto chambers a, a and c Between the first two o'l those is placed avalve seat a and between the last two is a second valve seat a while thechamber a has in its rear wall an opei'iing in which is set a thirdvalve seat (1 The main cast ing has an inlet opening into the chamb r (Land is'providcd with two valves and 1), ol' which the first is capableof engaging either ol the valve seats a" or a, while the secondisprovided with an integral lug or projection (1 and a pin (1 whereby itis mounted in the chamber of so as to, be capable oi engaging the seat(a The main casting A also has in oncsidcopenings into the chambers (1and (1 and these are both normally closed by a single cover plate A,which is, as shown in Fig. 2%, hinged to suitable lugs 11 screwed intosaid main valve casting. Between said cover and'the valve body A isplaced a gasket 0, and said cover is nori'nally maintained in positionto close the two openings into the chambers c and (1/ by means of boltsto.

A bracket e bolted to the outside of the general type described and i l1 g l l i I l main casting A and is so made as to )rovide a seat for aknife edge e fixed to a lever E which is ordinarily known as the hook.This lever has extending through it a set screw 6 and there is, provideda compression member 00 F mounted on a pair of arms f pivoted to thefoot casting B at f which is designed to transmit pressure between thevalve or clapper C and the lever E through this set screw. Said member Fii idly fixed to the clapper C and is slotted at its middle portion topermit oi the passage of a second compression member or strut G, towhich is loosely connectcd a pin f extending through a slot in saidstrut.

A small lever H known as a tu1nblei" is mounted upon a knife edge Itcarried by the foot casting B and is so constructed that one of its'armsis capable ol' engaging the lower end of the strut (l. The valve D has aprojecting portion d on its under face in which is a concave recess forthe reception of the upper end of this same strut, A third lever K ismounted upon a pin is supported by the foot casting B and has an armplaced to be engaged by the second arm of the lever constituting thetumbler II. There is also mounted upon this third lever and held to itin any suitable or desired manner a piece It, preferably though notnecessarily of cylindrical form, which extends substantially par allelto the axis of the pin it. This bearing piece is so placed as to beengaged by the long or downwardly extending arm of the hook E. which, asshown in Fig. 1, is preferably made plane at its end so as to engagetangentially with the bearing piece /r. The head or main portion oi thelever K has an integral arm it upon which is mounted a Weight It" heldin place by a nut. in addition, a connecting link 1, extends from thelower end of the hook E to the upper portion. ol the weight it, beingpinned loosely to both of these elements. That portion of thenieclninism above described which is outside ol the main valve 10o bodyinclosed within a two part casing M.

As is well understood by those skilled in this art, under conditions ofnsethe various parts are in the positions illustrated in Fig. 1, andthevalve is so connected to the other parts oi a dry pipe system that waterunder pressure is admitted to the chamber a, butis prevented from movingthe valve C, by air p ressure exerted upon the valve D and transmittedtherefrom through the strut G, tumpression member F. pressure Within thechamber 0, falls below a bler H, weight-lever K, hook E, and com If forany reason the predetermined point, the weight lever K, as

' well'as theair pressure against the valve G,

acts to lift the valve Dz. When the various parts are so moved that thevalve C is caused to enga e the valve seat a it will completely close 0the chamber a, from .the atmosphere. .Water is now freeto pass from thechamber a through the chamber aand into the chamber cf; the valve Dbeing swung u ward and back on its hinge pin. It is to enoted that theupper part of the main casting A is extended to the rear, therebyenlarging the chamber a sufiiciently to permit the valve D to liecompletely to one side of the cnrrent of 'fiuid passing through thevalve structure.

It will be noted that by the use .of a cylindrical bearingpiece k thesurface of contact between the hook E and the weight lever K is reducedto a minimum, the leverages are made constant, and the turningof theweight lever on its pivot when the movement of the valve D causes it tobe released from the tumbler, is greatly facilitated.

By the provision ofa single door or cover for closing the two openingsin the chamber a/ and a on the side of the main casting, theconstruction is materially simplified and the labor of getting into thevalve for the purposes of inspection etc., is materially lessened. Bymakin the weight k separate or removable from t e balance of theweightlever, I am enabled to make it of relatively cheap material, such aslead or cast iron, and yetat the same time constructthose parts of thelever whlch'are SllbJBOl) to stram and posslble corroslon, of stronger,non-corrosivematerial such as bronze. As is obvious, the manner ofassembling the parts of the weight lever is a relatively simpleoperation.

While in Figs. 1 and 4 I have shown the preferred form of the bearingiece 7c eniloyed between the hook E an the weight ever K, I may, ifdesired, use bearing pieces of other forms such as those shown at k inFig. 5, or k as shown in Fig. 6; it being necessary in any case thatthere be but a line bearing between the bearing piece and the hook E andthat the distance of this .line bearing from the axis of movement of theweight lever K remains constant irrespective of the position of saidlever.

I claim: 1. The combination in a dry pipe valve of a casing, a pluralityof valves controlling the flow of fluid through said casing, andmechanism operatively connecting said valves, said mechanism includin alurality of levers of which one is compose o a non-corrodible metal,with a weight made of some'other" I POWELL EVANS.

Witnesses WM. E. WATERs', 4 W. CLAYTON NEWBOLD.

